Start of funding 01.07.2015 | ||
Retinal and cortical pathways in age-related macular degeneration | ||
Prof. Dr. Mark Greenlee
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Prof. Dr. John S. Werner
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Macular degeneration is the major cause of legal blindness in industrialized countries, mostly affecting older persons (age related macular degeneration, AMD). It is now possible to understand this disease, not just as a retinal disorder, but in the larger context of neural degenerations. Details of the disease can be imaged in the retina with micrometer precision, while the fibers to central areas can be traced in the living brain using diffusion tensor imaging (DTI). We are identifying groups of individuals with AMD, a group with long-standing macular degeneration that affects young people (Stargardt’s disease) and age-matched normal controls. We will correlate areas of visual loss measured by microperimetry with their changes in the outer retina (photoreceptors and retinal pigmented epithelium) and then trace the projections into the brain using DTI. The results will inform us about changes in the brain associated with early and late-stage macular degeneration. As new and promising treatments to decrease the rate of retinal loss in these patients become available, along with novel treatments involving stem cells and genetic therapies, it will be essential to know what to expect at higher levels in the brain in order to facilitate rehabilitation. A better understanding of age-related macular degeneration is expected as it is now largely considered a retinal disease, but changes in the visual pathways are nearly certain at least in individuals with long-standing retinal lesions. This research is expected to broaden our understanding of neural pathology underlying macular degeneration. |
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Final report:
Macular degeneration (MD) affects the central retina and gradually destroys high spatial and chromatic central vision. That implies that in patients with MD large portions of the central visual pathways normally receiving afferent signals from the fovea will be unstimulated. The neuro-anatomical consequences of insufficient afferent and efferent stimulation has been reported in many conditions. In the current study, it was assumed that MD, that causes degeneration of the outer retina and photoreceptor dysfunction, could affect inner retinal neurons as well as could provoke microstructural changes in the nerve fibers of central visual pathways. | |
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